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leannamat2106
29.06.2019 •
Chemistry
Aglass blower can bend and shape a piece of glass that has been heated. is glass a crystalline or an amorphous solid?
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Ответ:
it would be a crystalline solid, because it could be extended in multiple directions.
Ответ:
The answer is![2.3\times 10^1](/tpl/images/0703/0484/3b5dd.png)
Explanation:-
Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.
Rules for significant figures:
Digits from 1 to 9 are always significant and have infinite number of significant figures.
All non-zero numbers are always significant. For example: 654, 6.54 and 65.4 all have three significant figures.
All zero’s between integers are always significant. For example: 5005, 5.005 and 50.05 all have four significant figures.
All zero’s preceding the first integers are never significant. For example: 0.0078 has two significant figures.
All zero’s after the decimal point are always significant. For example: 4.500, 45.00 and 450.0 all have four significant figures.
The rule apply for multiplication and division is :
The least precise number determines the number of significant figures in the answer.
For![3.47\times 6.7=23.249](/tpl/images/0703/0484/ecf3f.png)
As the figure 3.47 contains 3 significant digits and 6.7 contains 2 significant digits, the answer must contain 2 significant digits.
Thus the answer is![2.3\times 10^1](/tpl/images/0703/0484/3b5dd.png)